Conditioning occurs when people are aware of the relation between the conditioned stimulus (CS) and the unconditioned stimulus (UCS). This is done by simply linking the two stimuli together to then produce a newly learned response in animals. In the famous and ethically dubious experiment Watson and Rayner (1920) showed that classical conditioning applied to the human species as well. There are only three stages of the classical conditioning process. At each stage the stimuli and the responses are given specific scientific terms: Before conditioning, During conditioning and After conditioning.
Before conditioning the unconditioned stimulus (US) produces an unconditioned response (UDR) in an organism. So basically this would mean that a stimulus in a particular provided environment has produced a behaviour/response which is unlearned/unconditioned and therefore would be a natural response that has not been taught at